Blends of a polyphenylene ether resin, alkenyl aromatic resins modified with EPDM rubber and flame retardant

Abstract

Novel compositions are disclosed which include a polyphenylene ether resin and an alkenyl aromatic resin modified with an EPDM rubber. Also included with the scope of this invention are reinforced and flame-retardant compositions of said polyphenylene ether resin and said alkenyl aromatic resin modified with an EPDM rubber.

We claim: 
     
       1. A thermoplastic molding composition which comprises: a. from 20-65% by weight of a polyphenylene ether resin;   b. from 35-80% by weight of an alkenyl aromatic resin that is modified with a rubbery interpolymer of a mixture of monoolefins and a polyene by polymerizing an alkenyl aromatic monomer in the presence of said rubbery interpolymer; and   c. a flame retardant amount of a flame-retardant additive.   
     
     
       2. The molding composition of claim 1 wherein the polyphenylene ether resin is selected from compounds of the formula: ##SPC4## wherein Q is selected from the group consisting of hydrogen, hydrocarbon radicals, halohydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenol nucleus, hydrocarbonoxy radicals and halohydrocarbonoxy radicals having at least two carbon atoms between the halogen atoms and the phenol nucleus, Q' and Q" are the same as Q, and in addition, halogen with the proviso that Q and Q' are all free of a tertiary carbon atom; and n is an integer of at least 50.   
     
     
       3. A thermoplastic molding composition which comprises: a. from 20-65% by weight of a polyphenylene ether resin;   b. from 35-80% by weight of an alkenyl aromatic resin that is modified with a rubbery interpolymer which comprises 10-90 mole percent of ethylene, 10-90 mole percent of an alpha-olefin having from 3-10 carbon atoms and from 0.1-10 mole percent of a polyene that is a non-conjugated cyclic or open chain diene that has from 5-10 carbon atoms and is obtained by polymerizing an alkenyl aromatic monomer in the presence of said rubbery interpolymer; and   c. a flame retardant amount of a flame retardant additive.   
     
     
       4. The molding composition of claim 3 wherein said flame retardant is a halogenated organic compound, a halogenated organic compound in admixture with an antimony compound, elemental phosphorus or a phosphorus compound or compounds containing phosphorus-nitrogen bonds or a mixture of two or more of the foregoing. 
     
     
       5. The molding composition of claim 3 wherein said flame retardant comprises a mixture of an organic bromine containing compound with antimony oxide. 
     
     
       6. The molding composition of claim 3 wherein said flame retardant is triphenylphosphate. 
     
     
       7. The molding composition of claim 4 which includes 5-15 parts per hundred parts of components (a) plus (b) of a phosphorus compound. 
     
     
       8. The molding composition of claim 4 which includes from 2 to 20 parts by weight per hundred parts of components (a) plus (b) of a halogenated aromatic compound and from 1 to 10 parts by weight per hundred parts of components (a) plus (b) of antimony oxide. 
     
     
       9. The molding composition of claim 1 wherein said flame retardant is a halogenated organic compound, a halogenated organic compound in admixture with an antimony compound, elemental phosphorus or a phosphorus compound or compounds containing phosphorus-nitrogen bonds or a mixture of two or more of the foregoing.